RE: The ideal DC coil power supply? RE: RE: Xfmrs

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hello Steve, Jim, et al,

I just received my transformer ferrite "C" Cores. That took quite awhile
(since you first posted this schematic of the Geek forum). Big dudes! In the
mean while, I repotted a 12/30ma France and with half the shunts knocked out
and its making 60 ma! It is very well repotted in a combination of white
petroleum jelly, paraffin, and sealed with a higher melting point candle
wax. The LV and HV are connected to small pass-throughs on a lexan top. Its
fairly light but definitely "old school".

I'm waiting for a few more door knob caps for a full wave C-W quadrupler.

I'll post to the groups how well it conditions the big caps and the charge
time.

It will be a while before I get to your very cool charging circuit. I have
been working on a 3 phase diesel generator plant.

Regards,
Jim Mora

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Monday, March 05, 2007 10:55 PM
To: tesla@xxxxxxxxxx
Subject: Re: The ideal DC coil power supply? RE: RE: Xfmrs

Original poster: "Steve Ward" <steve.ward@xxxxxxxxx>

Ive been working on and off on my HVDC supply (CCPS).

Some info here:

http://www.stevehv.4hv.org/ccps1.htm

I havent really used it for tesla coiling much except for a few tests.
It really needed an output filter, and some other isolation to keep
it happy, but it did work.  I mainly use it for powering a C-W stack
or charging my large 5kj pulse cap (which it does rather quickly).  I
really like the SLR topology, its well behaved for short circuit
loads.  The output is basically constant current (close enough,
anyway...).

Steve


On 3/2/07, Tesla list <tesla@xxxxxxxxxx> wrote:
>Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
>
>At 03:37 PM 3/2/2007, Tesla list wrote:
> >Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>
> >
> >If you just want something that's more than an NST but
> >less than a pig, 120 volts input, small enough to
> >carry/roll around easily, consider a PT:
> ><snip>
>
>
>
>
> >If you just want to build a mini-pig then go for it.
> >But if you want portability, I doubt you'll be able to
> >get something as powerful, small, light as a PT.
>
>
>What I'd like to see is a 15-20 kV DC supply that I can do triggered
>spark gap coils with.  Say, 10 kW average power (30-40 Amps off 240V
>line).  Doesn't need great regulation (actually, a constant current
>source might be ideal), but does need fairly low ripple (because I
>don't want line frequency hum).  Oh yeah.. I'd like low stored energy
>on the HV side so it doesn't  blow things up (no giant DC filter
>capacitor to get rid of ripple).
>
>Actually, I wonder if you could design it so it had the equivalent of
>the inductor and diode in a resonant charging (that is, when the gap
>fires, it shuts down for a short time to allow the gap to quench, and
>then turns back on).  It would be easy to give it an enable/disable
>that's synchronized with the gap trigger.  It's simple to turn a PWM
>on and off, but the output of the supply is going to have to take the
>abuse of the ringing on the primary capacitor (i.e. the output will
>swing negative), so it might not just be a matter of gating the
>switcher on and off.
>
>Say if it weighed 20 lbs and was "milk crate" sized that would be
>fine.  (after all, the 30A power cord is going to weigh a substantial
>amount)...
>
>
>
>
>
>
>
>